Observation of a New Charmed Baryon Decaying to Ξ_{c}^{+}π^{-}π^{+}

De Angelis C.;Dettori F.;Fabiano F.;Litvinov R.;Manca G.;Oldeman R.;Provenzano D.;Saitta B.;
2025-01-01

Abstract

The Ξ_{c}^{+}π^{-}π^{+} spectrum is investigated using proton-proton collisions at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 5.4  fb^{-1}, collected by the LHCb experiment during 2016-2018. Four states are observed with high significance, and their masses and widths are measured to be m[Ξ_{c}(2815)^{+}]=2816.65±0.03±0.03±0.23  MeV, Γ[Ξ_{c}(2815)^{+}]=2.07±0.08±0.12  MeV, m[Ξ_{c}(2923)^{+}]=2922.8±0.3±0.5±0.2  MeV, Γ[Ξ_{c}(2923)^{+}]=5.3±0.9±1.4  MeV, m[Ξ_{c}(2970)^{+}]=2968.6±0.5±0.5±0.2  MeV, Γ[Ξ_{c}(2970)^{+}]=31.7±1.7±1.9  MeV, [Ξ_{c}(3080)^{+}]=3076.8±0.7±1.3±0.2  MeV, Γ[Ξ_{c}(3080)^{+}]=6.8±2.3±0.9  MeV, where the uncertainties are statistical, systematic, and due to the limited precision on the Ξ_{c}^{+} mass, respectively. The Ξ_{c}(2923)^{+} baryon is observed for the first time, and is consistent with being the isospin partner of the previously observed Ξ_{c}(2923)^{0} state. Most of the measured parameters are more precise than existing world averages.
2025
Inglese
135
16
161901
Esperti anonimi
scientifica
Aaij, R.; Abdelmotteleb, A. S. W.; Abellan Beteta, C.; Abudinen, F.; Ackernley, T.; Adefisoye, A. A.; Adeva, B.; Adinolfi, M.; Adlarson, P.; Agapopoul ...espandi
1.1 Articolo in rivista
info:eu-repo/semantics/article
1 Contributo su Rivista::1.1 Articolo in rivista
262
1157
open
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